摘要
研究了天然硅藻土吸附水溶液中染料酸性红BR的热力学特性,结果表明:平衡吸附量随温度的上升而上升;吸附等温线符合Langmuir和Freundlich方程,表明主要是物理吸附,属于多层吸附。吸附过程中吸附焓变ΔH>0,为吸热反应;吸附Gibbs自由能变ΔG<0,因而能自发进行;吸附熵变ΔS为正值。此外,根据实验数据,计算了吸附势E,其值随吸附量增多而减小。
The adsorption thermodynamics of acid BR on nature diatomite in aqueous solution was studied. The results show that the adsorption capacity of dye increases with the temperature. The dye adsorption fit well to Langmuir and Freundlich isotherm which indicates that it belongs to multilayer adsorption. It is mainly physical adsorption. The positive val- ues of the adsorption enthalpy AH indicates the exothermic reaction; The negative adsorption Gibbs free energy changes AG indicates adsorption being spontaneous; In addition, adsorption potential E which was calculated from the experimental data decreases as the adsorption capacity increasing.
出处
《水科学与工程技术》
2009年第1期23-25,共3页
Water Sciences and Engineering Technology
